When most people think of the Victorian Era, they tend to assume everything was squeaky clean. They assume people were all prim and proper, that sobriety was a thing, and that people just died from disease and poisons they used every day.
Most of this is a fairly correct assumption, minus the drug use. Prior to 1914, cocaine and many other drugs were perfectly legal. In fact, they were often used as over-the-counter remedies for everything from sore throats to weight loss.